/* * pSeries_lpar.c * Copyright (C) 2001 Todd Inglett, IBM Corporation * * pSeries LPAR support. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* Enables debugging of low-level hash table routines - careful! */ #undef DEBUG #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "plpar_wrappers.h" #include "pseries.h" /* in hvCall.S */ EXPORT_SYMBOL(plpar_hcall); EXPORT_SYMBOL(plpar_hcall9); EXPORT_SYMBOL(plpar_hcall_norets); extern void pSeries_find_serial_port(void); static int vtermno; /* virtual terminal# for udbg */ #define __ALIGNED__ __attribute__((__aligned__(sizeof(long)))) static void udbg_hvsi_putc(char c) { /* packet's seqno isn't used anyways */ uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c }; int rc; if (c == '\n') udbg_hvsi_putc('\r'); do { rc = plpar_put_term_char(vtermno, sizeof(packet), packet); } while (rc == H_BUSY); } static long hvsi_udbg_buf_len; static uint8_t hvsi_udbg_buf[256]; static int udbg_hvsi_getc_poll(void) { unsigned char ch; int rc, i; if (hvsi_udbg_buf_len == 0) { rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf); if (rc != H_SUCCESS || hvsi_udbg_buf[0] != 0xff) { /* bad read or non-data packet */ hvsi_udbg_buf_len = 0; } else { /* remove the packet header */ for (i = 4; i < hvsi_udbg_buf_len; i++) hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i]; hvsi_udbg_buf_len -= 4; } } if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) { /* no data ready */ hvsi_udbg_buf_len = 0; return -1; } ch = hvsi_udbg_buf[0]; /* shift remaining data down */ for (i = 1; i < hvsi_udbg_buf_len; i++) { hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i]; } hvsi_udbg_buf_len--; return ch; } static int udbg_hvsi_getc(void) { int ch; for (;;) { ch = udbg_hvsi_getc_poll(); if (ch == -1) { /* This shouldn't be needed...but... */ volatile unsigned long delay; for (delay=0; delay < 2000000; delay++) ; } else { return ch; } } } static void udbg_putcLP(char c) { char buf[16]; unsigned long rc; if (c == '\n') udbg_putcLP('\r'); buf[0] = c; do { rc = plpar_put_term_char(vtermno, 1, buf); } while(rc == H_BUSY); } /* Buffered chars getc */ static long inbuflen; static long inbuf[2]; /* must be 2 longs */ static int udbg_getc_pollLP(void) { /* The interface is tricky because it may return up to 16 chars. * We save them statically for future calls to udbg_getc(). */ char ch, *buf = (char *)inbuf; int i; long rc; if (inbuflen == 0) { /* get some more chars. */ inbuflen = 0; rc = plpar_get_term_char(vtermno, &inbuflen, buf); if (rc != H_SUCCESS) inbuflen = 0; /* otherwise inbuflen is garbage */ } if (inbuflen <= 0 || inbuflen > 16) { /* Catch error case as well as other oddities (corruption) */ inbuflen = 0; return -1; } ch = buf[0]; for (i = 1; i < inbuflen; i++) /* shuffle them down. */ buf[i-1] = buf[i]; inbuflen--; return ch; } static int udbg_getcLP(void) { int ch; for (;;) { ch = udbg_getc_pollLP(); if (ch == -1) { /* This shouldn't be needed...but... */ volatile unsigned long delay; for (delay=0; delay < 2000000; delay++) ; } else { return ch; } } } /* call this from early_init() for a working debug console on * vterm capable LPAR machines */ void __init udbg_init_debug_lpar(void) { vtermno = 0; udbg_putc = udbg_putcLP; udbg_getc = udbg_getcLP; udbg_getc_poll = udbg_getc_pollLP; register_early_udbg_console(); } /* returns 0 if couldn't find or use /chosen/stdout as console */ void __init find_udbg_vterm(void) { struct device_node *stdout_node; const u32 *termno; const char *name; /* find the boot console from /chosen/stdout */ if (!of_chosen) return; name = of_get_property(of_chosen, "linux,stdout-path", NULL); if (name == NULL) return; stdout_node = of_find_node_by_path(name); if (!stdout_node) return; name = of_get_property(stdout_node, "name", NULL); if (!name) { printk(KERN_WARNING "stdout node missing 'name' property!\n"); goto out; } /* Check if it's a virtual terminal */ if (strncmp(name, "vty", 3) != 0) goto out; termno = of_get_property(stdout_node, "reg", NULL); if (termno == NULL) goto out; vtermno = termno[0]; if (of_device_is_compatible(stdout_node, "hvterm1")) { udbg_putc = udbg_putcLP; udbg_getc = udbg_getcLP; udbg_getc_poll = udbg_getc_pollLP; add_preferred_console("hvc", termno[0] & 0xff, NULL); } else if (of_device_is_compatible(stdout_node, "hvterm-protocol")) { vtermno = termno[0]; udbg_putc = udbg_hvsi_putc; udbg_getc = udbg_hvsi_getc; udbg_getc_poll = udbg_hvsi_getc_poll; add_preferred_console("hvsi", termno[0] & 0xff, NULL); } out: of_node_put(stdout_node); } void vpa_init(int cpu) { int hwcpu = get_hard_smp_processor_id(cpu); unsigned long addr; long ret; if (cpu_has_feature(CPU_FTR_ALTIVEC)) lppaca_of(cpu).vmxregs_in_use = 1; addr = __pa(&lppaca_of(cpu)); ret = register_vpa(hwcpu, addr); if (ret) { printk(KERN_ERR "WARNING: vpa_init: VPA registration for " "cpu %d (hw %d) of area %lx returns %ld\n", cpu, hwcpu, addr, ret); return; } /* * PAPR says this feature is SLB-Buffer but firmware never * reports that. All SPLPAR support SLB shadow buffer. */ addr = __pa(&slb_shadow[cpu]); if (firmware_has_feature(FW_FEATURE_SPLPAR)) { ret = register_slb_shadow(hwcpu, addr); if (ret) printk(KERN_ERR "WARNING: vpa_init: SLB shadow buffer " "registration for cpu %d (hw %d) of area %lx " "returns %ld\n", cpu, hwcpu, addr, ret); } } static long pSeries_lpar_hpte_insert(unsigned long hpte_group, unsigned long va, unsigned long pa, unsigned long rflags, unsigned long vflags, int psize, int ssize) { unsigned long lpar_rc; unsigned long flags; unsigned long slot; unsigned long hpte_v, hpte_r; if (!(vflags & HPTE_V_BOLTED)) pr_devel("hpte_insert(group=%lx, va=%016lx, pa=%016lx, " "rflags=%lx, vflags=%lx, psize=%d)\n", hpte_group, va, pa, rflags, vflags, psize); hpte_v = hpte_encode_v(va, psize, ssize) | vflags | HPTE_V_VALID; hpte_r = hpte_encode_r(pa, psize) | rflags; if (!(vflags & HPTE_V_BOLTED)) pr_devel(" hpte_v=%016lx, hpte_r=%016lx\n", hpte_v, hpte_r); /* Now fill in the actual HPTE */ /* Set CEC cookie to 0 */ /* Zero page = 0 */ /* I-cache Invalidate = 0 */ /* I-cache synchronize = 0 */ /* Exact = 0 */ flags = 0; /* Make pHyp happy */ if ((rflags & _PAGE_NO_CACHE) & !(rflags & _PAGE_WRITETHRU)) hpte_r &= ~_PAGE_COHERENT; lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot); if (unlikely(lpar_rc == H_PTEG_FULL)) { if (!(vflags & HPTE_V_BOLTED)) pr_devel(" full\n"); return -1; } /* * Since we try and ioremap PHBs we don't own, the pte insert * will fail. However we must catch the failure in hash_page * or we will loop forever, so return -2 in this case. */ if (unlikely(lpar_rc != H_SUCCESS)) { if (!(vflags & HPTE_V_BOLTED)) pr_devel(" lpar err %lu\n", lpar_rc); return -2; } if (!(vflags & HPTE_V_BOLTED)) pr_devel(" -> slot: %lu\n", slot & 7); /* Because of iSeries, we have to pass down the secondary * bucket bit here as well */ return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3); } static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock); static long pSeries_lpar_hpte_remove(unsigned long hpte_group) { unsigned long slot_offset; unsigned long lpar_rc; int i; unsigned long dummy1, dummy2; /* pick a random slot to start at */ slot_offset = mftb() & 0x7; for (i = 0; i < HPTES_PER_GROUP; i++) { /* don't remove a bolted entry */ lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset, (0x1UL << 4), &dummy1, &dummy2); if (lpar_rc == H_SUCCESS) return i; BUG_ON(lpar_rc != H_NOT_FOUND); slot_offset++; slot_offset &= 0x7; } return -1; } static void pSeries_lpar_hptab_clear(void) { unsigned long size_bytes = 1UL << ppc64_pft_size; unsigned long hpte_count = size_bytes >> 4; struct { unsigned long pteh; unsigned long ptel; } ptes[4]; long lpar_rc; int i, j; /* Read in batches of 4, * invalidate only valid entries not in the VRMA * hpte_count will be a multiple of 4 */ for (i = 0; i < hpte_count; i += 4) { lpar_rc = plpar_pte_read_4_raw(0, i, (void *)ptes); if (lpar_rc != H_SUCCESS) continue; for (j = 0; j < 4; j++){ if ((ptes[j].pteh & HPTE_V_VRMA_MASK) == HPTE_V_VRMA_MASK) continue; if (ptes[j].pteh & HPTE_V_VALID) plpar_pte_remove_raw(0, i + j, 0, &(ptes[j].pteh), &(ptes[j].ptel)); } } } /* * This computes the AVPN and B fields of the first dword of a HPTE, * for use when we want to match an existing PTE. The bottom 7 bits * of the returned value are zero. */ static inline unsigned long hpte_encode_avpn(unsigned long va, int psize, int ssize) { unsigned long v; v = (va >> 23) & ~(mmu_psize_defs[psize].avpnm); v <<= HPTE_V_AVPN_SHIFT; v |= ((unsigned long) ssize) << HPTE_V_SSIZE_SHIFT; return v; } /* * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and * the low 3 bits of flags happen to line up. So no transform is needed. * We can probably optimize here and assume the high bits of newpp are * already zero. For now I am paranoid. */ static long pSeries_lpar_hpte_updatepp(unsigned long slot, unsigned long newpp, unsigned long va, int psize, int ssize, int local) { unsigned long lpar_rc; unsigned long flags = (newpp & 7) | H_AVPN; unsigned long want_v; want_v = hpte_encode_avpn(va, psize, ssize); pr_devel(" update: avpnv=%016lx, hash=%016lx, f=%lx, psize: %d ...", want_v, slot, flags, psize); lpar_rc = plpar_pte_protect(flags, slot, want_v); if (lpar_rc == H_NOT_FOUND) { pr_devel("not found !\n"); return -1; } pr_devel("ok\n"); BUG_ON(lpar_rc != H_SUCCESS); return 0; } static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) { unsigned long dword0; unsigned long lpar_rc; unsigned long dummy_word1; unsigned long flags; /* Read 1 pte at a time */ /* Do not need RPN to logical page translation */ /* No cross CEC PFT access */ flags = 0; lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); BUG_ON(lpar_rc != H_SUCCESS); return dword0; } static long pSeries_lpar_hpte_find(unsigned long va, int psize, int ssize) { unsigned long hash; unsigned long i; long slot; unsigned long want_v, hpte_v; hash = hpt_hash(va, mmu_psize_defs[psize].shift, ssize); want_v = hpte_encode_avpn(va, psize, ssize); /* Bolted entries are always in the primary group */ slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; for (i = 0; i < HPTES_PER_GROUP; i++) { hpte_v = pSeries_lpar_hpte_getword0(slot); if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) /* HPTE matches */ return slot; ++slot; } return -1; } static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, unsigned long ea, int psize, int ssize) { unsigned long lpar_rc, slot, vsid, va, flags; vsid = get_kernel_vsid(ea, ssize); va = hpt_va(ea, vsid, ssize); slot = pSeries_lpar_hpte_find(va, psize, ssize); BUG_ON(slot == -1); flags = newpp & 7; lpar_rc = plpar_pte_protect(flags, slot, 0); BUG_ON(lpar_rc != H_SUCCESS); } static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va, int psize, int ssize, int local) { unsigned long want_v; unsigned long lpar_rc; unsigned long dummy1, dummy2; pr_devel(" inval : slot=%lx, va=%016lx, psize: %d, local: %d\n", slot, va, psize, local); want_v = hpte_encode_avpn(va, psize, ssize); lpar_rc = plpar_pte_remove(H_AVPN, slot, want_v, &dummy1, &dummy2); if (lpar_rc == H_NOT_FOUND) return; BUG_ON(lpar_rc != H_SUCCESS); } static void pSeries_lpar_hpte_removebolted(unsigned long ea, int psize, int ssize) { unsigned long slot, vsid, va; vsid = get_kernel_vsid(ea, ssize); va = hpt_va(ea, vsid, ssize); slot = pSeries_lpar_hpte_find(va, psize, ssize); BUG_ON(slot == -1); pSeries_lpar_hpte_invalidate(slot, va, psize, ssize, 0); } /* Flag bits for H_BULK_REMOVE */ #define HBR_REQUEST 0x4000000000000000UL #define HBR_RESPONSE 0x8000000000000000UL #define HBR_END 0xc000000000000000UL #define HBR_AVPN 0x0200000000000000UL #define HBR_ANDCOND 0x0100000000000000UL /* * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie * lock. */ static void pSeries_lpar_flush_hash_range(unsigned long number, int local) { unsigned long i, pix, rc; unsigned long flags = 0; struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch); int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE); unsigned long param[9]; unsigned long va; unsigned long hash, index, shift, hidx, slot; real_pte_t pte; int psize, ssize; if (lock_tlbie) spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags); psize = batch->psize; ssize = batch->ssize; pix = 0; for (i = 0; i < number; i++) { va = batch->vaddr[i]; pte = batch->pte[i]; pte_iterate_hashed_subpages(pte, psize, va, index, shift) { hash = hpt_hash(va, shift, ssize); hidx = __rpte_to_hidx(pte, index); if (hidx & _PTEIDX_SECONDARY) hash = ~hash; slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; slot += hidx & _PTEIDX_GROUP_IX; if (!firmware_has_feature(FW_FEATURE_BULK_REMOVE)) { pSeries_lpar_hpte_invalidate(slot, va, psize, ssize, local); } else { param[pix] = HBR_REQUEST | HBR_AVPN | slot; param[pix+1] = hpte_encode_avpn(va, psize, ssize); pix += 2; if (pix == 8) { rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], param[2], param[3], param[4], param[5], param[6], param[7]); BUG_ON(rc != H_SUCCESS); pix = 0; } } } pte_iterate_hashed_end(); } if (pix) { param[pix] = HBR_END; rc = plpar_hcall9(H_BULK_REMOVE, param, param[0], param[1], param[2], param[3], param[4], param[5], param[6], param[7]); BUG_ON(rc != H_SUCCESS); } if (lock_tlbie) spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags); } void __init hpte_init_lpar(void) { ppc_md.hpte_invalidate = pSeries_lpar_hpte_invalidate; ppc_md.hpte_updatepp = pSeries_lpar_hpte_updatepp; ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp; ppc_md.hpte_insert = pSeries_lpar_hpte_insert; ppc_md.hpte_remove = pSeries_lpar_hpte_remove; ppc_md.hpte_removebolted = pSeries_lpar_hpte_removebolted; ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range; ppc_md.hpte_clear_all = pSeries_lpar_hptab_clear; } #ifdef CONFIG_PPC_SMLPAR #define CMO_FREE_HINT_DEFAULT 1 static int cmo_free_hint_flag = CMO_FREE_HINT_DEFAULT; static int __init cmo_free_hint(char *str) { char *parm; parm = strstrip(str); if (strcasecmp(parm, "no") == 0 || strcasecmp(parm, "off") == 0) { printk(KERN_INFO "cmo_free_hint: CMO free page hinting is not active.\n"); cmo_free_hint_flag = 0; return 1; } cmo_free_hint_flag = 1; printk(KERN_INFO "cmo_free_hint: CMO free page hinting is active.\n"); if (strcasecmp(parm, "yes") == 0 || strcasecmp(parm, "on") == 0) return 1; return 0; } __setup("cmo_free_hint=", cmo_free_hint); static void pSeries_set_page_state(struct page *page, int order, unsigned long state) { int i, j; unsigned long cmo_page_sz, addr; cmo_page_sz = cmo_get_page_size(); addr = __pa((unsigned long)page_address(page)); for (i = 0; i < (1 << order); i++, addr += PAGE_SIZE) { for (j = 0; j < PAGE_SIZE; j += cmo_page_sz) plpar_hcall_norets(H_PAGE_INIT, state, addr + j, 0); } } void arch_free_page(struct page *page, int order) { if (!cmo_free_hint_flag || !firmware_has_feature(FW_FEATURE_CMO)) return; pSeries_set_page_state(page, order, H_PAGE_SET_UNUSED); } EXPORT_SYMBOL(arch_free_page); #endif #ifdef CONFIG_TRACEPOINTS /* * We optimise our hcall path by placing hcall_tracepoint_refcount * directly in the TOC so we can check if the hcall tracepoints are * enabled via a single load. */ /* NB: reg/unreg are called while guarded with the tracepoints_mutex */ extern long hcall_tracepoint_refcount; void hcall_tracepoint_regfunc(void) { hcall_tracepoint_refcount++; } void hcall_tracepoint_unregfunc(void) { hcall_tracepoint_refcount--; } void __trace_hcall_entry(unsigned long opcode, unsigned long *args) { trace_hcall_entry(opcode, args); } void __trace_hcall_exit(long opcode, unsigned long retval, unsigned long *retbuf) { trace_hcall_exit(opcode, retval, retbuf); } #endif